Heating element and support therefor



'vAug. 16, l932 S. CHRISTY 19872407 z HEATING ELEMENT AND SUPPORT THEREFR Filed Oct. 22, 1928 2 Sheets-Sheet l Aug. 16, 1932. s. CHRISTY HEATING ELEMENT AND SUPPORT THEREFOR 2 sheets-shawl .2

Filed Oct. 22, 1928 /57 for ffff e 5 Patented Aug. k16, 1932 lUNITEI) srA'rEs PAT-ENT OFFICE sur om, or Das Hormis, Iowa f nume .ummm AND sUPPoa'r mamon Application tiled Dctcbet 22, 1.928.r y Serial No. 314,083.

to provide therein novel means formount-r ing the resistance units in a 'manner convenient for installation, removal or replace- 10 ment. v

Another purpose is to provide in such a device various novel features of construction of the case and parts supported thereon.

15 Still another feature is toy providein such a broiler, whereby the objects contemplated are attained, as hereinafterrnore fully set forth, pointed out in my claims, and illustratedin the accompanying drawings, in which: 25 Figure l shows a perspective view of a combination stove, oven and broiler embodying my invention. n r f Figure 2 shows a detail, sectionalr view taken on the line 2 2 of Figure 1. f Figure 3 is a longitudinal, detail, sectiona view taken on the line 3 3 ofFigure 1. y

Figure 4 is a horizontal, sectionalffview taken on the line 4 4 of Figurel.y

Figure 5 isa detail, sectional view taken 821 on the line 5 5 of.v Figure 3.

Figure 6 is a perspective view of one of the insulator blocks. f

Figure 7 is a rperspectiveview rof one of theresistance unit hangers. f 4U Figure 8 is aV perspective viewk of a portion of one of the resistanoeunita f l y Figure 9 is an elevation of one of` the resistance units, themetal cap therefore being shown in section. L,

Figure 9A isa perspective view of another form of cap and hanger. y

Figure 9B is a perspective view of a modiiedform of a connector; andy Figure 10 is a detail, sectional view taken 5C onthe line 10- 10' of Figure-3.

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shown in Figure 2, an inner rear wall indipurposes."

My improved combination cooking device comprises a casing having double back and end walls, atop and a bottom` and a front.

In the accompanying drawings, I have cated by the reference character 10, comprising a vertical sheet, preferably of metal, having at its upper edge the over and downturned member 12, so ormedfor reinforcing Near its lower portion, the inner lower wall member 10 has above its lower edge an ifiwardl projectinglange v14:. At its lower edge, he wall member 10 is turned inwardly or forwardly to form the flangeV 16; The material atthe forward end of the flange 16 is bentand extendedv rearwardly to form alower parallel flange 16a, havingl at its rear edge thek upwardly projecting flange 1Gb spaced from the 'wall 10. n

fFormed preferably integrally withv the ends of the walls 10 are the inner end'wallalf 18. The inner end walls ,18k are provided with pairs of llanges'20. These Vfla-"tiges 20' y are for thepurpose of receiving," and support-"iw Y ing shelves, pans or the like. y

At the bottom edge of each end member 18 is an iii-turned horizontal `flange 22. From the inner edgeof each Harige' 22; the

material is turned outwardly to-form a'seeond lower, parallel ang'e 24 terminating in, an upwardly inclined flange 6 'spaced from the end wall 18as shown yinlFig'ure 3.

/ Spaced rearwardly from the rear wall 1 is an outer rear wall 28, having its upper end s" beaded or folded over asat 30, and its lower end lbentv upwardly to form a channel32.

` A downwardly opening channel 34 is arranged at the'bottom of and between the walls` f,

10 and 28 with its angesia and 345' re''w'f ceived between the flange' 16D' and the wall 10 and in the channel 32 respectively, as shown l in Figure 2.y

The space between the walls 10 and 28 may be filled with any suitable insulating ma- 9' teri'all 36. This spacey is coveredy by a cove!" plate 38 having downwardly projecting flanges r` 38a fitting" adjacent to 'the upper edges of the walls 10 and 28. f

The upper surface of the plate 38 is pf l vided with spaced parallel long'tudinal grooves 40. Spaced laterally from each inner end member 18 .is an outer end member in the form of a plate or wall having its upper end beaded as at 42a, and its lower edge bent to form an upwardly opening channel 44.

At the lower parts of the end members 42 and 18 at each end of the casing, downwardly opening channel 46 has its flanges 46a received in the channel 44 and between the flange 26 and wall 18 respectively.

The space between the walls 42 and 18 at each end of the device is filled with heat insulating material 86. such hL already been mentioned. This space is covered at the top by means of a cover plate 48, similar to the cover plate 88 already described. The cover plates 38 and 48 may be integrally connected if desired.

The end members 42 are connected at their upper parts by a longitudinal frame member 50 having at its upper edge the groove 52 and in its lower edge the rabbet 54.

At their lower parte, the end members 42 are connected by a front frame or wall member 56, having at its upper edge the rearwardly projecting flange 58 and at its lower edge the forwardly opening channel 60 and between its upper and lower edges the forwardly projecting flange 62. The channel 60 is so shaped as to form a shelf or shoulder projecting slightly rearwardly from the frame member 56.

Hinged to the frame member 56 is a door 64 for closing the front of the casing. The bottom of the casing is formed by means of a removable member, comprising a plate 66,

having at its ends the outwardly opening channels 68, which may slidably receive the its side edges with the laterally projecting.,

flanges 78 adapted to slide between the lower most pair of flanges 20, as shown in Fig- -ure 3.

I provide a similar pan 80, which may have its flanges 82, corresponding to the flanges 78 slid between the members of upper pairs of flanges 20.k

A perforated plate 84 with a down-turned peripheral flange 86 may be placed in the pan 80.

At the upper part of the casing, I provide a pan holding frame for receiving a similar pan.

To each side wall near the front thereof an arm 88 is pivoted at its lower end and is inclined upwardly. A shaft 90 is mounted in the end walls near the rear of the casing about the same height as the pivots of the arms 88.

Arms 92 have hubs 94 fixed on the shafts 90 by means of set screws 96.

The front and rear arms 88 and 92 are arranged parallel as shown in Figure 2.

At each end of the casing an inwardly opening channel 98 shown in Figure 3 is pivoted to the upper ends of the respect-ive arms 88 and 92.

On one end of the shaft 90 outside the casing is a crank 100. By manipulating the crank 100, the shaft 90 may be rotated for rocking the arms 92 and 88 and swinging the channels 98 forwardly or rearwardly.

For holding the frame thus provided in different positions of its adjustment, I provide a series of holes 102 in one of the end walls 42. The crank arm 100 is resilient and is provided with a pin 104 (see Figure 3) to coact with the respective holes 102.

I provide a pan 106 having the peripheral flange 108 (see Figure 3). At the ends of the pan 106 laterally projecting flanges '110 are formed. The flanges 110 are adapted to slide into the channels 98, (see Figure 3).

A plate 84 similar to that already described may be placed in the pan 106. The pan 106 may be used for broiling, and insomuch as the upper heating units are immediately above it, it is sometimes desirable that it should be raised higher than it normally stands, when the arms 88 and 92 are in their upright positions.

For raising it upwardly after it has cleared the wall member 50, I provide the following means:

In the upper ends of the arms 88 and 92 are elongated slots 112. The channels 98 are mounted on the arms 88 and 92 by means of pins 114 eXtending from the channels .8 through the slots 112 and into guide channels 116 mounted on the inner faces of the walls 18.

These guide channels open inwardly and are curved as shown in Figures 2 and 5, so that when thc arms 88 and 92 are in their lowered positions, illustrated in Figure 5 in dotted lines, for holding the pan 106 in its position projecting out of the casing, and are then swung upwardly toward their vertical positions, the pins 114 will enter the lower forward parts of the channels 116. The dotted line position of the arm 88 and pin 114 illustrates those parts in their positions then assumed.

As the arms 88 and 92 finish their rearward. inward stroke. the pins 114 are guided upwardly in the channels 116, thus raising the. channels 98 and the pin 106, until the pins 114 stand substantially above the lower` sa'y ures 2 and 5. A coverplate 118 forms the top ofthe cas# ing. f.

Asbestos wicking or the like 120 may be placed in the grooves 40jand 52, and the plate*A 118 is provided with ribs 122 to fit into said grooves for forming tight joints;

The material aroundthe hole'is beveled, and

the hole is normally closed by a beveled lid* or closure member 126. The lid 126 has a smaller similar hole 128 into which fitsfa smaller similar lid 130. Around'the hole 128 is a. raised, annular corrugated rib 13,2,

upon which an upright pan or the like may be seated, if desired.

It willbe'seen that if one ofthe lids 130v or 126 is removed, and a pan is lacedl in Aposition above the hole thus left, eatmay" escape upwardly around suchv pan or the like.

I will now describe the lmounting and ari rangement vof the heating units .in my improved` combination stove, oven. andy broiler. I provide a plurality of insulating blocksy 134,l which serve to support the resistance units. Each of these insulator blocks is made in the general form of a channel, as shown in F igure, preferably withshallow ribs 136, extending lengthwise in spacedre# lationl from each other and from the flanges of the channel. f

ing wires or posts 146. 'y

A series .of these blocks 134 is arranged'end n to' end, opening rearwardly in alignment. againstthe upper part oftheinner face ofthe rear wall 10. Theyy are secured tothe wall 10 by means of bolts 142 (Figure 3) ex-y tended through the holes 138 (Figure 6) and through vthe wall 10.

the channels opening outwardly.y

lBefore the blocks .134 are installed as above mentioned, theyhave assembled Von them re sistance unit hangers suitably connected in the following manner: f

The holes 140 for the wires orposts146 are arranged in pairs, which are respectively horizontally aligned. X

` The pairs are arranged at vdifferent heights and are staggered as shown in Figure 6.

Metal conducting strips 144 are arranged on the inner face ofthe channel between each pair of holes, as shownr in Figure 6.

The posts or wires 146`r fare extended through the fr ends of each through the holes 140.

on `what maybe @anedthe bask Sid@v or,

outer side of each ,channel-shaped: block '134, there is mounted on each post 146 a resi-st-v ance unit hanger or support 14,8, comprising `The plate 118 is formed With a hole l124.k

strap 144 andy a fiat strip, havingf atf its upper endl aQpro.-

Jectingll-shaped yoke150, the, arms ofr which e .form acontracted neck'152; The yokes 150 may be arrangedI opening downwardlyfas.

shown iny Fig re 7. The hangers 148 are provided `wit a series of holesV 15.4. The posts 146-are extended through one of the holes 154 in each resistance unit hanger and'` the hangers are thus adjusted tothe same heightsy in horizontally yspaced pairs yonfeach block 134.

4At the back of they casing, each hanger 148 kis aligned lwith a similar hanger at the front of the. casing. Y

The two upper hangersk are connected byy one; of the strips 144, the next two lower hangers by a similar. strip,y andthe two lower y hangers by asimilar strip. l

rPhus thelirst andl fourth, second and'fifth, and third and sixth hangers of each block are connectedV together. i A manyy blocks maybe used as may be desire I f shownthree of them aligned: at the front and three at the back of thecasi 0.

The resistance units extelrli'ding fore-andaft in the casing are ofthefkind illustrated in Figure 8comprising a pencil 155 of porcelain. or the like having crossed slots'156in its ends. A-nichrome wire or other resistance wire 158 is wound on each 4pencil and has its end extended through Vone of the slots 156 as at 158a, Holes are provided at 138 for supporting bolts, and are provided for current conductof a metal cap 16() mountedon each end of the pencil 155.. `The caps 160 arek snapped into the yokes and on. account of the peculiar structure` herein explained are'easily installed andarev very'easily removed for thepurpose` of replacing any resistance vunit which may A similar row of blocks 134 is secured to. f the inner face ofthe wall member 50 with` with hanger elements 148e having the spaced" holes 154e similar to the holes 154. At the uy per end of each hanger element 14811 is yan oy et upwardly projecting tapered end 1486.' When the hanger elements 148e are employed, I use a cap e shown in Figure .9A for the ends of thecresistance units. The cap 160Ql has two spaced parallel slots 1606 in its ends. The metal between the slots is pressed out to forma guide 1600 to receive the tapered end 148K). f

A similar arrangement of resistaneeunitsis provided in the lbottonrf the case;

'The wiring arrangement fer'lboth the top In the illustration here shown, I have` IUE and bottom sets of resistance units is il1ustrated in Figure 4. In that figure, I have shown the conducting wires 162 and 163. The wire 162 is connected for instance with t-he Y three left-hand posts 146 at the front of the casing. The three-left-hand posts at the back of the casing are connected by the appropriate strips 144 with the fourth, fifth and sixth posts from the left.

The fourth, fifth and sixth posts from the left at the front of the casing are then connected by the appropriate strips 144 with the fourth, fifth and sixth posts from the left.

The fourth, fifth and sixth posts from the left at the front of the casing are then connected with the seventh, eighth and ninth posts and so on for connecting all of the resistance units.

Coming now to the three right-hand posts 146 at the front of the casing, it will be noted that I have provided a switch A having the movable member 164 connected with the lead wire 163, and having the three contact points marked-1, 2 and 3.

Contact point 1 is connected by a wire 165 with the second post from the right hand end of the casing at the front thereof. A branch wire 166 connects the wire 165 also with contact point 3. Y

Contact. point 2 is connect-ed by a wire 16T with the right-hand post 146 at the front of the casing. A branch wire 168 connects the wire 167 with the third Contact post 146 from the right.

Thus it will be seen that the movable switch member 164 may be moved to neutral or circuit breaking position or may be moved to contact with post No. 1.

In that case, a circuit will be closed through mj the movable switch member 164, the wire 163, the wire 162, the second resistance unit from the left, and then to the right through each third resistance unit to the second resistance unit from the right, the wire 165, and the contact 1.

By swinging the switch member 164 until it clears contact point 1, it can be made to engage Contact point 2, and thus close a circuit through two-thirds of the resistance units.

By moving the switch member 164 until it engages both contacts 2 and 3, a circuit will be closed through all of the resistance units.

rPhe switch A is for the control of the units at the bottom of the casing, and a similar switch B (Figure 1) is provided for controlling circuits through the units at the top of the casing.

From the foregoing, it will be seen that I have provided a combination cooking stove, oven and broiler, which can be used for a great variety of purposes.

My device is of very simple construction and can be made `largely of stampings, so that it is economical.

The resistance units are cheap to make and they can be easily replaced when they burn out. The lower ones are replaced by opening the door and taking out the catch pan, whereupon the lower units can be taken out and others put in their places. The upper units can be replaced by lifting off the top unit 118 for giving access to them.

By removing the pan 80 or putting it in a little lower position than that shown in Figure 3, my device may be used as an oven for baking pies, cakes or bread. Steaks may be broiled or fried, and cooking of any kind may be done.

The small lid 130 may be removed and dishes or pans placed over the hole 128 for keeping them warm.

Similarly the lid 126 may be removed for the same purpose.

The upper pan 106 is used primarily for broiling and can be held quite close to the up* per resistance units on account of the peculiar mechanism for controlling it.

I preferably arrange below the hole 124 a grid or the like 200 to keep small pans or other containers from dropping through the hole 124.

It will be obvious, of course, that changes may be made in the details of the structure of my device without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims, any modified forms of structure or use of mechanical equivalents, which may be reasonably included within their scope.

I claim as my invention:

1. In a device of the class described, a resistance unit comprising an insulator core having a resistance wire wound thereon, metal caps for the ends of said core and means of connection between said resistance wires and said caps comprising crossed slots in the ends of said cores for receiving the ends of the resistance wire, first in one slot. then around the periphery of the core, then through the other slot and contacting with the wire therein after which the caps are forced onto the ends of the core and over the ends of the resistance wire.

2. Means for supporting the ends of resistance units comprising clips, channel shaped insulator blocks, said clips being mounted on the faces of said blocks with members which extend through the blocks and into the recesses thereof and electrical connecting means between the members extending through the blocks comprising members extending longitudinally in said recesses.

3. Means to support a resistance unit coinprising an end cap on each end of the unit and having a pair of slits therein, the portion of the cap between said slits being bent outwardly from the cap and a clip for each cap having a prong to extend through such outwardly bent port-ion and frictionally engage therein.

4. A resistance unit comprising a core having crossed slots in each end thereof, a resist.-y p ance wire wound on sald coreand havlng ends extending through one slot on each end of said core, then around said core to and through the other slotand caps of'conductf ing material fitted ysnugly over said ends of said cores and contacting with said ends` of said resistance Wire wound thereon.

5. Means to support a resistance unit comprising an end cap on each end of said unit and connected with the resistance wire thereof, each end cap having a slitA therein, a ortion of the cap adjacent said slit being ent outwardly from said cap and a clip for each cap having a portion extending through said slit and into said outwardly bent portion.

Des Moines, Iowa, December 16, 1927.

SAM- CHRISTY. 

